While annoying enough when used as a meatshield for stronger enemies, later on, she can be buffed to the point of killing nearly everything in your army in one or two hits. While UltraBaaBaa may have very low health, she compensates with an unbelievably strong, 266,000 HP barrier, making her practically invulnerable unless a barrier breaker can land a hit on her.Normally he's no problem because of his Arbitrary Minimum Range, but with units to tank for him he becomes a massive nuisance by constantly warping your units to let stronger foes advance. Mole with the ability to Warp units and a weak Barrier. Corporal Weyland is a weaker Alien Mr.Fortunately, his attack power is a lot lower than the original, making him more of an annoyance than an actual threat. The once-annoying task of getting close to him and pummeling him is now even more annoying since he can sometimes just warp any offenders away again. Project A, Master A.'s starred Alien variant, has the ability to Warp units, while still retaining his nonstop attacks and infuriatingly long range.He also has the ability to sometimes halve the attack of Cats, which will tend to happen a lot due to his ridiculous attack rate. Zroco has rather low health, but boasts ungodly DPS that allows him to shred even tanks with ease.They can then pop up in your backlines when least expected and start attacking, potentially chipping away at your base. Znaches have a stupidly long burrow range, being able to burrow through most of the stage.
Similarly to Gabriel, he can also block off your units by virtue of his short range and very fast movement speed. Much higher attack and health, and instead of knocking them back, he can reduce their attack power, severely weakening your offense.
Angel is essentially a Trolly Blogger on steroids. Combine this with the fact that they almost always come in a Zerg Rush, and you have a stack of angry birds that can shred your meatshields with their wave attacks.